Beginning with Gemini IV on June 3, 1965, control of the flights shifted from the Cape to new facilities in Houston. Meters gave way to computer screens. Ad hoc conference calls gave way to a nationwide communications network. The modest goal of simply understanding what was happening to the spacecraft gave way to ambitions for solving hardware problems while the flight was still in progress. By the time the Apollo manned flights began, the Mercury Control Center that supported John Glenn’s Mercury flight had been supplanted by a system that was to Mercury Control as the Saturn V was to the
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